As math c2 question!

I am trying to do geometric sequence question..I NEED URGENT HELP PLES!!

This is the question

"I invest £A in the bank at a rate of interest of 3.5% per ammum. How long will it be BEFORE i double my money?

I seriously dont understand what the word before implies .

My steps are like
A * (1.035)^n-1 < 2A
n<21.148
Hence n = 21

But the acutal answer is 20.15

I tried the solution bank but didn't find it helpful.

Thank You

I am trying to do geometric sequence question..I NEED URGENT HELP PLES!!

This is the question

"I invest £A in the bank at a rate of interest of 3.5% per ammum. How long will it be BEFORE i double my money?

I seriously dont understand what the word before implies .

My steps are like
A * (1.035)^n-1 < 2A
n<21.148
Hence n = 21

But the acutal answer is 20.15

I tried the solution bank but didn't find it helpful.

Thank You

What does n represent in your equation?

Think about what it means when n = 1, n= 2 etc in your equation.

n is the number of years


Posted from TSR Mobile

Right.. so when n=1, that's one year, what does the left hand side of your equation suggest? (what I am trying to hint at has been given above already)

Okay i see what you mean.. Kinda..
But then..
How does this relate to the equation
Nth term = ar^n-1??


Posted from TSR Mobile